hey Jeff,
sent another message; but as far as cam, i'd put a new heart in if i could..
should be $120-150 cam and lifter kit.. could even (for same price) get an RV grind
make the hills under load more tolerable, and pick up some mpg too..
your OEM GM# 24503401 is cam,
i think int/exh was .250/.255
i lean to Isky or Crane; but GM and Comp Cams are both very affordable, and still
great for the price..
hope this helps..